nonnucleated
11cell — cell1 cell like, adj. /sel/, n. 1. a small room, as in a convent or prison. 2. any of various small compartments or bounded areas forming part of a whole. 3. a small group acting as a unit within a larger organization: a local cell of the… …
12mammal — mammallike, adj. /mam euhl/, n. any vertebrate of the class Mammalia, having the body more or less covered with hair, nourishing the young with milk from the mammary glands, and, with the exception of the egg laying monotremes, giving birth to… …
13platelet — /playt lit/, n. Cell Biol. a small platelike body, esp. a blood platelet. [1890 95; PLATE1 + LET] * * * or thrombocyte Small, colourless, irregular blood cell crucial in coagulation. Produced in bone marrow and stored in the spleen, platelets… …
14Cambrian Period — Oldest time division of the Paleozoic Era. During the Cambrian, 543–490 million years ago, there were widespread seas and several scattered landmasses. The largest continent was Gondwana. The average climate was probably warmer than today, with… …
15Morgan, Thomas Hunt — born Sept. 25, 1866, Lexington, Ky., U.S. died Dec. 4, 1945, Pasadena, Calif. U.S. zoologist and geneticist. He received his doctorate from Johns Hopkins University. As a professor at Columbia University (1904–28) and California Institute of… …
16Margulis, Lynn — ▪ 2001 At a White House ceremony on March 14, 2000, Pres. Bill Clinton presented the U.S. National Medal of Science to eminent microbiologist Lynn Margulis, one of 12 distinguished recipients. She was cited “for her outstanding… …
17ancient Greek civilization — ▪ historical region, Eurasia Introduction the period following Mycenaean civilization, which ended in about 1200 BC, to the death of Alexander the Great, in 323 BC. It was a period of political, philosophical, artistic, and scientific… …
18bleeding and blood clotting — ▪ disease Introduction escape of blood from blood vessels into surrounding tissue and the process of coagulation through the action of platelets. Significance of hemostasis The evolution of high pressure blood circulation in… …
19Stratum corneum — The stratum corneum as a rule refers to the outermost layer of the epidermis, which is itself the outer layer of the skin. The full name of the stratum corneum of the skin is the stratum corneum epidermidis. The other stratum corneum, the stratum …
20megalocyte — A large (10–20 μm) nonnucleated red blood cell. [megalo + G. kytos, cell] * * * meg·a·lo·cyte meg ə lə .sīt n MACROCYTE meg·a·lo·cyt·ic .meg ə lə sit ik adj * * * n. see …
